Oh sorry, well I would like to keep the sword that T7 nowheres lightsaber 7 pack gives to uthar, but when I run this mod with shems robes for korriban students mod, Uthar does not show up with his sword because they both modify 39utharwyn.utc
And I asked a friend and he said that I probly needed to merge the two files, but I have no idea of what merging is or how to do it

What you will want to do is open up KOTOR Tool. Then click file, open and then open up the two 39utharwyn.utc files of interest. Then at the bottom of the file menu, you'll see a button called inventory, click it. Do something like hold your cursor over the equipped item (green outline) and see what the reference is, may have to double click, I can't remember exactly. Then copy one of the references to the same item slot of the other utc file and save. That should solve your problem, let me know if it doesn't work.